The Quartet on the Middle East (also referred to as the Madrid Quartet) is a grouping of countries and international entities established to to lead mediation in the Israeli-Palestinian peace process. The members of the Quartet are the United States, European Union, United Nations and Russia. 2017 2016 2015 2013 2012 2011 2010 2008 2007 2006 2005 2004 2002
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